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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b6bdabbae2b19e7ba90e4fba9b9731caeb8a6e70582ef83fc636d047361d48' 
  AND token = '3aCBKhhOSNKvLiz/HJhw1QEqEUNT4j+bqEN15/P11ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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