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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c97951610e5e85613b6c93447f7921460bc4e1a31dee48811f06c11d962027' 
  AND token = 'iJODfKjcZmj3LmStJ3G3mmlZ5xW+gVy8fupRQYjx9Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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