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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59748374e40a395615ca6b1fa9d8f3228c6f5718a1c43efd3ab67151d13f6b76' 
  AND token = 'Mi1t5AUE9VOpgwI9vs0GF226ePfg3ylFEyGMDk0Xvts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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