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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8186674784b61787e7d78c438714c6bb3317342b98b2ae6c1e9ecc46595547' 
  AND token = 'BRCGwt1M7hou4/EbLTA2viR0/kn9a6MIgBo5X7N56FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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