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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f759b3bca74baa9b9d6ab63c5bbe5778d111b0eab15060d907971d6caf8cee4d' 
  AND token = '6Q8Hd4P0JAHlf7EIFQh2OepqmcklDYgj0f7fKRFBhx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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