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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d25ec2e798aac93d0ce07310ea628babd9a39a5990abb8625b7b581eff439b6' 
  AND token = 'oJE83U+KmX6l8mCD+VRxotszZR/Xk+Id7tWRulkqzCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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