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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8dfc1c21d5c5d9cfda7738b1d951242fdfd0710a6e478e46da76f03a2b90ee9' 
  AND token = '82NzhqCyG8zkPCJkDALKiahxIHYkDwKlF8ckwJIAHxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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