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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be42c0fbcc075bebf29d426b797e910bdc0869b656fa2b9e09b59f2fdb7b696e' 
  AND token = '80zvZJ1SWsqMfFsiFj6PTvWIka3mYt8QW5XPfF6CBOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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