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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66ecfae57e7db7d0e99948990c6d9d6e7865c7ea1b7d6cbdc8c0d2ad148eac3' 
  AND token = 'wazizJtE0V89N5ZfaPCiKnEWOL2Q9/XUaUSaNEd0Wwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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