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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693d339dd6e6e5a6f272b8fe9bbf9dd4e9fb11c0b8c85b4b9102d7725913d380' 
  AND token = 'ap0FyUTcEHAFrpEZzkDEYrFcjnbXmiI+Dlvco8VcdmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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