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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cedfd2008eafcb1ffb1b0e9597d91d9ebc8a29d3b6ab6bd2ddefc39f60d8d61' 
  AND token = 'IDSzskj9sGYx1HxKhafozgq4dFDfQ5JpLpyD7mqpdq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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