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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5709f24b88a65a205aa1b0b2fcdcc890e56553c2d86658cd5daf9cb0a51578' 
  AND token = 'UFQXCdizpE0HuW/tQLSemSITSn/O3hJu1E3IsY8X0wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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