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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36982fec2a94becca23f3d58d4317574f346da1fb498e2e86003e953ba1d668f' 
  AND token = 'kwd/5Ayb6A+GPsVOIrtYIkjqbn/Bo2V/mxW34qRGE0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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