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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4214b8f56cd6c8eedbf5717f4df69a6d37cab07d88a081ba37c4e08f3086de' 
  AND token = 'Epfute7vFjhTj6k96IscF5Vfh2OjQXm08YPTfhDo25Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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