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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf9a49242efcbcfe4d0fb5652d566873caf4b7d20c5f9e451719e966c0e10ba' 
  AND token = '3LJVACaMprmiMcJsHsLBFW7auf+t0o2cJgDfe44YT3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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