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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e1d433bdcb65c9b9c51c2737d1ec436eac6ff3c2c92ac82617dc76957d37ff' 
  AND token = 'amPgeVN1IRPAeTiMH10F5elv3+l/s3nuHdXdhsoinxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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