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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbba5748bf23ee4f973af65807de7326f4e4f52b694be8c3f1bdd7731f30c4e' 
  AND token = '3exGEyeOofVIaOEHmAA5PNtLFLx9JOeIi+AeL6Us7cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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