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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30edcfdeff3b30a8c9577395175c7d284135907357306a7f5f3569f4853f5a34' 
  AND token = 'vhaHjDqY+0CYWP3HV+MAEM99rWQJ5zXJ/vyWkEDMCxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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