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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e27b4bd94eefc8cf1734f84924c324b32c6fed441b7e0f55a5ace36df823dd0' 
  AND token = 'GVoq0Gg8YfhdTyxelXFL/SkdYDvk1k/MNMAInNUxok0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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