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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d50676f8c1dad48d7ba0531cf75799109d3ce4df7d7546d68317247e79f6f04' 
  AND token = 'xy+KB+O+pt6EIuyJ0oYgCkijlU36vm/S0udPff3yfSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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