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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b82688726a41b3159405d21ba66dec89a9cc6fea514511070bc58b9ae2307d' 
  AND token = 'HiTbSPEh6tmlFzLSKqn2xP5MUyS6RgH9PgXtlUmwTqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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