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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57be072a29b84d8a2e0f6353fdd63e5df994eaf489d8db30409d4e9a49ff3825' 
  AND token = '8VOl0K1oRxLu0eAIwwkeEs/vR/IVIwSuk6hPw5clzdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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