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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ebf3b6c61a34ef9d4312ac29eed25fb5ab58bdb659effd76631979dfbb0a64' 
  AND token = 'HSWXX1mP4M5tjtfhonJSejZ3yhTP80I+/bC1kilIYHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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