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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f932c1cdced3e167f3b230aee4b0cf3b417b7e15c8cd77a4544d15d23b927d5' 
  AND token = 'ZqiuvJHg4iiDuMpO0NdYbdb1EoQpITir7cmGygk3yLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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