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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90412114148415e20eb3c91f1f65f595a2563fd0d03e34f2f55abe69c23a9d3' 
  AND token = 'bwX8j8tYZznHTa2k/ltQp3VgSDk64QjH9o3Dl47teaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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