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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70792728a661d7b84bea8c56bd06624ef231efad2e65044d64226ac6516809ea' 
  AND token = 'mKPlevbzYLUh34i/fLWbSqJcJkiJSN525qA1gfjACC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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