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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f254cbc9f29da0e5feb365e92f909ba5ae20288a43b7ab373f11832080eaf7d1' 
  AND token = 'UO6mdKgYwMZHgkRgMSS0b4eyd3k1n8q9FnwRWR96lMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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