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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f46179d527248881f34af40a0728d195d36aaf5f42bc3a5e70230af4197806' 
  AND token = 'V4n+S+AEV4WglKtaB6iRB1PmNSfdRdmBgvvRcb0Kfq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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