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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba0df4aa3a13ae941b9794bf3aa868f4cda7e83d92356bcee5c9d88b9282b4' 
  AND token = '/NBbsx46qEtr0lRCDfslP7hvFocOnY07uBftXk+S27M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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