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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9019002d594b1473a24cf01aa807712123b06f7b4bc82b975a8e225b55ccfc79' 
  AND token = 'nuuUDs6lSW3UPdSvbdq+66tP5bBU5w2abQ2EH8QGrHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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