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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1057ca391e7cdbc98c45e94795793912e9f4cd6b98a60992695df7006e36059b' 
  AND token = 'D3QU35U0L9LaA4K6Y4MjULJvDra3LYkpu4KD4fi6+2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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