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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0542c5a8767fad12f88a9fc2aac194de2a6d9d077b4406784236fc6bd2d428' 
  AND token = 'SmYbb56ha0auQjVolsgsnmnP/DM0EeTy1OJUhgX4eFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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