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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067ec5ef13eab69614d746ae8260e438be148cce925bbf102ba9caad5260bb2e' 
  AND token = 'krCmg+gp59eUUnY1hQh4oIAtCfzs4ZV+Sv7zcDZN59g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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