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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2106d5e695e60444c28f7bbb0d4c3d33f4c210c9aede3e4e7b6094ebc20a8613' 
  AND token = 'H05eOwniXJ7rZlLhZQT4Of722o1b+zXe8cDzbFrDJyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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