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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5015d1a7062be91b4ef57a9ac94166f676a6f7d4a255fe5d5d1e7d5a2170658' 
  AND token = 'uROfuav3Rdiegh8RndwknQHu+z44lFVVUFjZ05WUBQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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