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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b21eb221ed909cd55f5f7b41c580002e8705655d6b523533f3b9d0858f08884' 
  AND token = 'CxHk3iikhKPJRGP//2k0T3lDVRbbzXKBhVtrDTlJXMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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