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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488ea50a3976f6a400358e8342f68b282c6759509c81e5141779862174fed575' 
  AND token = 'XPYYfKY/NXfEq8pjz4524R2b19oiKsA4C0v249VtOmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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