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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1062a9f7440c5a42a380ffc69c0ba06588ba8a1a1a70ec50591a5d155ded5f' 
  AND token = 'XfxunJ6hAsyHsQ56FKeZBDasCLdQrJflDqZLSYr3/3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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