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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde4e81e14da238e1b6438a40268913b694ac4a076058892843b38668848ab8f' 
  AND token = 'HbQZTrRKH9lrjmBQSMzKIMRPpU05Agk2pguz3ntOy8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}