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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3ba83a7877be4da770fa2a62a558460a672f1b54c808cf2658bdf071a763a5' 
  AND token = 'bDH34x8yclrfKTECkUDslOP3toiG+rg6UsBGavuQ+To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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