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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced966b8cf0e759559a56493255866f8425da9f2123a2efb6fe75285f47351bf' 
  AND token = '3pwa11Kx2uZ+lKcimREwnbcnM5Xu01y+sdmwIZWWAMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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