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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438b39991d7b9e5014c312d02ad15ee5c0475d745399f912cf38d0dc34e4fd43' 
  AND token = 'ChYYNkzVLFXL/I7WijUoJMpjQadRq03erlQkzgDbdhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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