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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de33b32e310df4e57db2ee6d6b3ad0420344184d80e5c94d7ffaa8ab86f282b' 
  AND token = 'sMB09b1b7iMoB8DVY7u0tC9r5JshVBfTmjeisIYSYng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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