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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020d58e42b2fb17fd5128bd8d513f2baf6f7ab8b1e420b881dc88017c8379f14' 
  AND token = 'Trfvf7r/+5CbkJ0gEwHmnOojQRIPotZgRc+p17bp9vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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