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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd3fc0308031aaa80ffb2a3b4e9851590ca345a40dab4e62d13cc7583c92ca9' 
  AND token = '4spmwXamqCzgSMLrMyqTp5VLGn5Faxaxu5O7s63EjSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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