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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58936a295c454fac4ca52468904f6e6085f6440e90646cadfd851d16dd0e471a' 
  AND token = 'qu2R0iWVQGGmwJELVikZQ96twECpzRWEK4k09ywyS4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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