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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0605c75b3f815c74e3f62ccd35e39801d0bf0545f264067a221e2af088f0a1d3' 
  AND token = 'Rc5XYdIE5sQjzMQkCNAoVJoWORKH073S20cG5CfIZKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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