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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e0a6fd60544bea671cf55a40a8935072b49228f0d59889a0a767750b607729' 
  AND token = 'eTMm1BTH9StKsnt8UwXdMFxP0D8ceTcv16Pp8timy1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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