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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e531028168bb82a70e567dac855171252de881c7b465c5afba8b338a5655d749' 
  AND token = 'cTEXBrszFV5L7SghrSTVwqm1WyH35Y0cfJDEPxuU+1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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