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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85df4f5cd18aff23e40dc663c6965d1a1e1311554e854671a75fbfef90f64482' 
  AND token = 'KHdQTJoSxsfZ/V9Iq5dPgGx1FZE9OVJG8t+r3WH05WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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