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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f55d98b77a6edf0dda4932bf95e1878a7a97e099173eb65ac87bdbe711b4c48' 
  AND token = 'QAWAg2ONOkhQd8X6ZKYaibh8xNGksRSle09dSknCHqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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