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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0d5c5fbcc2104a5c27d463eb1ea1c5a1f1c6cbd812749fa5da92347fc97c28' 
  AND token = 'aigvpZZaOFkFWCluaOPHMszbGirCPr+HVHdX4JU8o9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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