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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303701760e09d67c81d94a9853a37dd9784db709965d99b7cff3286aa20b3525' 
  AND token = 'QGAra7Of/Zr+6bGuvOKAtR1Ej99Gk6JxXf5gkij7kto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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