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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73fd5b22f251cb2c5ab55ac147c67789aba89271203638d4254d3dc33ffd0cc' 
  AND token = 'BdjtZWxhXcW4steQ5EnzLtrYSpocx4a1vT0L2nBGet8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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