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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf09fa449f4053a98d261dae11fcf4df35d4cff1151f6ccf13e43755f5b6ee16' 
  AND token = '8zDQhr5ig8x5b8MZe3ISQgkADqAWiWhKMSdL4BI2tDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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