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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e793df2ea18b50c873c4e1e1090e8a33733eebad058c9133d8f4bac3e818209c' 
  AND token = 'ZUJpTMtuV5e1H3bxSoSG/kWtVhpe2/HRK5l1mKERfNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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