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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beca996bd91c9926ddd94f5144e5900e37f390f980b14eb8dec0e2d4f94825d2' 
  AND token = 'aGwR3Ps7W30lrH+jVQ6VOeAN86jIBTO4dg/LzpgLsTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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